What Is Zinc Oxide Ointment Used For? 6 Uses

Zinc oxide ointment is one of the most versatile over-the-counter skin products available, used for everything from diaper rash and minor wounds to sun protection and skin-fold irritation. The thick, white paste works primarily by forming a physical barrier on the skin’s surface that blocks moisture, irritants, and ultraviolet radiation, while also delivering mild antibacterial and anti-inflammatory effects. Six of its most common and well-supported uses span a range that makes it worth keeping in almost any medicine cabinet.

How Zinc Oxide Protects and Heals Skin

Before getting into specific uses, it helps to understand why one ingredient shows up in so many different products. Zinc oxide sits on the skin rather than soaking deeply into it. That physical layer does two things at once: it shields the tissue underneath from external irritants like urine, sweat, and friction, and it slowly releases zinc ions into the upper layers of skin. Those ions play a role in processes your body already uses to repair damaged tissue, fight off bacteria, and calm inflammation.

Zinc oxide’s antibacterial action has been studied in some detail. Research has shown that zinc oxide nanoparticles disrupt bacterial cell membranes, reduce the ability of bacteria to stick to surfaces, and interfere with biofilm formation, with particular activity against Staphylococcus aureus, a common cause of skin infections.¹ Other work has confirmed that zinc oxide also has antifungal properties, showing dose-dependent activity against Candida species and other skin pathogens.² The killing mechanism appears to involve the production of reactive oxygen species that break apart bacterial cells.³

Combined, these properties, barrier formation, antibacterial and antifungal action, anti-inflammatory effects, and support for tissue repair, explain why zinc oxide turns up as an active ingredient in such a wide range of skin-care products.

1. Diaper Rash

This is probably the use most people think of first. Diaper dermatitis happens when prolonged contact with urine and stool breaks down the skin’s natural barrier, creating redness, irritation, and sometimes open sores. Zinc oxide ointment addresses the problem from multiple directions: it physically blocks moisture from reaching already-irritated skin, reduces bacterial colonization in the affected area, and has no serious side effects after many decades of widespread use.⁴

A systematic review and meta-analysis of barrier preparations found that zinc oxide paste was effective in managing diaper dermatitis among neonates.⁵ In practice, concentrations range from around 5% for mild cases up to 25% or higher for more stubborn rashes. A recent randomized trial testing 25% zinc oxide ointment on infants found that roughly two-thirds of babies experienced complete recovery, with the rest showing partial improvement.⁶

For parents navigating the diaper-cream aisle, it is worth knowing that zinc oxide ointments and plain petrolatum-based barriers appear to have broadly comparable effects on diaper rash severity.⁷ The zinc oxide version may have a modest edge when mild infection is present, because of its antibacterial properties, but either option works well for routine prevention. The key is applying a generous layer at every diaper change so there is always a barrier between the skin and moisture.

2. Wound Healing and Minor Burns

Zinc oxide has a long history in wound care that researchers have argued is underappreciated. A review of the evidence on zinc in wound healing found that topical zinc application outperforms oral zinc supplementation for wound repair, because the ointment delivers a sustained release of zinc ions directly to the injury site. Those ions stimulate the regrowth of skin cells, help clear away dead tissue through enhanced local defense systems, and fight off secondary infections.⁸

Human wound-healing studies have investigated the effect of topical zinc oxide on standardized wounds, assessing how quickly the skin regrows and how inflammation responds, and the results support its role in promoting skin repair.⁹ In burn wounds specifically, an experimental study comparing zinc oxide to silver sulfadiazine, a standard burn treatment, found that zinc oxide performed better on multiple measures: the skin regrew faster, the deeper layers of tissue matured more quickly, and scarring was reduced. Wounds treated with zinc oxide reached 50% regrowth in about 21 days compared to about 26 days for the silver sulfadiazine group.¹⁰

That said, zinc oxide ointment at home is best reserved for minor, superficial wounds and first-degree burns. Anything deeper, larger, or showing signs of infection warrants professional care. The ointment works as a protective dressing more than a replacement for medical treatment.

3. Sun Protection

Zinc oxide is one of only two mineral (sometimes called “physical”) sunscreen filters approved in most markets, the other being titanium dioxide. Unlike chemical sunscreens that absorb UV radiation and convert it to heat, zinc oxide particles sit on the skin surface and scatter or reflect UV rays before they can reach living cells. The key advantage is breadth: microfine zinc oxide blocks radiation across the entire UV spectrum, including the longer UVA I wavelengths that penetrate deeper into skin and contribute to aging and cancer risk. It is also photostable, meaning it does not break down under sun exposure, and it does not react with organic sunscreen ingredients when they are combined in the same product.¹¹

The traditional complaint about zinc oxide sunscreen is the white cast it leaves on skin, which is why many modern formulations use nanoparticle-sized zinc oxide to reduce visible whiteness while still providing UV protection. If you have sensitive skin or react to chemical sunscreen ingredients like oxybenzone or avobenzone, a zinc oxide-based sunscreen is often the go-to recommendation from dermatologists. It is also the preferred option for young children, because the ingredient stays on the skin surface rather than being absorbed systemically.

4. Chafing and Intertrigo

Intertrigo, the red, raw irritation that develops where skin folds rub together, affects a wide range of people: athletes, anyone carrying extra weight, older adults with reduced mobility, and people living in hot, humid climates. The condition thrives on moisture and friction, which is exactly what zinc oxide barriers are designed to combat. A scoping review of moisture-associated skin damage management identified zinc oxide-based barriers as an effective option, noting that they coat and shield the skin from moisture and irritants.¹²

A clinical trial comparing zinc oxide ointment to a honey-based barrier cream in patients with symmetrical intertrigo in large skin folds found that both treatments were effective for the majority of patients.¹³ Newer formulations have combined zinc oxide with ingredients like panthenol and glycerin in spray form for easier application to hard-to-reach areas, targeting both athletes and overweight individuals with mild-to-moderate intertrigo.¹⁴

For everyday chafing between the thighs or under the breasts, a thin layer of zinc oxide ointment before physical activity can prevent the problem from starting. The ointment is thicker and stickier than many anti-chafing products marketed to runners, which means it stays in place longer during sweating but also takes more effort to wash off. Some people prefer it precisely because it outlasts lighter products during long workouts or shifts on their feet.

5. Eczema and Sensitive Skin

Zinc oxide is not a first-line treatment for eczema (atopic dermatitis), but it serves a useful supporting role. An evidence-based review of topical micronutrients in atopic dermatitis found that zinc, along with magnesium and iodine, appears to improve eczema through anti-inflammatory and antimicrobial effects, though the authors noted that more research is needed to evaluate zinc as a standalone therapy.¹⁵

Where zinc oxide ointment proves especially useful for eczema-prone skin is during flare-ups that involve broken or weeping skin. The physical barrier keeps irritants out of compromised areas, and the mild antimicrobial properties help guard against secondary infection, which is a common complication of eczema. It also provides a protective layer underneath bandages or wet wraps, a technique used to calm severe flares. Because zinc oxide is well tolerated and rarely causes allergic reactions, it is a reasonable option for people whose skin reacts to the preservatives, fragrances, or active ingredients in other moisturizers and barrier creams.

Research on skin exposure to zinc oxide formulations has shown that direct application was associated with up to a 3.5-fold reduction in skin barrier damage and redness when the skin was subsequently challenged with an irritant, with the greatest protection seen from formulations containing zinc oxide.¹⁶ That protective effect suggests a real benefit for anyone whose skin is routinely exposed to irritants, whether from incontinence, occupational exposure, or the chronic barrier dysfunction that defines eczema.

6. Acne

Zinc’s role in acne treatment has been recognized for a long time, both in oral supplements and topical formulations. A dermatology review noted that zinc, in various forms, has been used for acne vulgaris among other inflammatory skin conditions.¹⁷ More recently, researchers have developed advanced zinc oxide nanoparticle formulations specifically targeting acne. A preclinical and clinical study found that sustained release of zinc ions from these formulations promoted cell repair, reduced sebum (oil) production, and had anti-inflammatory effects that supported scar-free acne healing and helped prevent recurrence. A clinical trial confirmed the formulation’s ability to reduce acne lesions and redness with a strong safety profile.¹⁸

Plain zinc oxide ointment from the drugstore is not going to replace your benzoyl peroxide or retinoid for moderate-to-severe acne. But for mild breakouts, or as a spot treatment on inflamed pimples, the antibacterial and anti-inflammatory properties can take the edge off. Some people dab a thin layer on active spots overnight. The thick, occlusive texture is not ideal for acne-prone skin over large areas, since it can trap oil if applied too heavily, so targeted application makes more sense than full-face coverage.

Is Zinc Oxide Safe on Skin

One of the most studied safety questions about zinc oxide concerns nanoparticle sunscreens and whether those tiny particles can penetrate through your skin and into your bloodstream. A study in which volunteers applied zinc oxide nanoparticle sunscreen repeatedly found that the particles accumulated on the skin surface and within skin furrows but did not enter the viable (living) layers of the epidermis and did not cause cellular toxicity. While a small amount of zinc ions did penetrate into the skin, this did not appear to cause local damage.¹⁹

When zinc oxide is applied to intact skin in higher concentrations, like the 25% found in many ointments, some zinc does permeate through. A study using an occlusive zinc oxide dressing on intact human skin measured a mean release rate of about 5 micrograms of zinc per square centimeter per hour, and zinc concentrations in the upper skin layers were elevated beneath the treated area compared to control skin.²⁰ This low-level zinc absorption is generally considered beneficial rather than harmful: it is part of how the ointment promotes wound healing and supports local immune function. Zinc oxide ointment has been used for decades without reports of serious side effects from topical application.⁴

Allergic reactions to zinc oxide itself are exceptionally rare. When someone does react to a zinc oxide product, the culprit is almost always another ingredient in the formulation, such as lanolin, fragrance, or a preservative. If you suspect a reaction, switching to a simpler formulation with fewer added ingredients is the first step.

A Warning for Pet Owners

While zinc oxide is remarkably safe when applied to human skin, it poses a genuine danger if ingested in significant quantities by pets, particularly dogs. A veterinary case report documented hemolytic anemia, a condition in which red blood cells are destroyed, in a dog that ingested “max strength” zinc oxide diaper rash cream. The case was unusual because zinc oxide from diaper cream was historically thought to have poor gastrointestinal absorption and to require large quantities to cause toxicity. The dog ultimately recovered with supportive care, but the case highlighted that the risk from modern high-concentration zinc oxide creams may be greater than previously assumed.²¹

If you use zinc oxide ointment on a baby or on yourself in a household with dogs, keep tubes capped and stored out of reach. Dogs are drawn to the greasy texture and sometimes to the smell. Even small breed-size dogs can develop zinc toxicity from what might look like a small amount of cream. Symptoms to watch for include vomiting, lethargy, dark or orange-tinted urine, and pale gums. If you suspect your dog has eaten zinc oxide cream, contact a veterinarian promptly rather than waiting for symptoms to appear.

Practical Tips for Getting the Most Out of Zinc Oxide Ointment

Zinc oxide ointment works best when it actually stays on the skin long enough to do its job. For barrier protection, whether for diaper rash, chafing, or intertrigo, apply a thick enough layer that you can see a white coating on the skin. A translucent smear is too thin to form a meaningful barrier. You do not need to fully remove the old layer at every application unless the area needs cleaning; wiping off just the soiled outer portion and adding fresh ointment on top is standard practice for diaper rash and avoids unnecessary friction on irritated skin.

The ointment’s thickness, which is its biggest functional advantage, also makes it hard to remove. Baby oil or mineral oil dissolves it much more effectively than soap and water. Rubbing aggressively with a washcloth will irritate the very skin you are trying to protect. For chafing prevention before exercise, applying it to clean, dry skin gives the best adhesion. Putting it on over sweaty skin is mostly a waste of effort because it will slide off within minutes.

For wound care, apply a thin layer to clean, dry, superficial wounds. Zinc oxide should not be packed into deep or puncture wounds, and it should not be used on infected wounds that need medical attention. On minor scrapes and shallow burns, it serves as a soothing, mildly protective dressing that you can cover with a bandage.

When choosing a product, zinc oxide concentration matters more than branding. Products range from about 5% up to 40%. Lower concentrations are fine for routine prevention and mild irritation. Higher concentrations offer a thicker barrier and are better suited for more stubborn rashes or situations with heavy moisture exposure. The inactive ingredients vary widely between brands, so if you have sensitive skin, look for formulations with shorter ingredient lists and no added fragrance.